Eraser cleaner



June 27, 1939. F-. HENNEFER 2,163,788

ERASER CLEANER Filed July 22. 1925s z Sheets-Sheet 1 WredLQ/eme er.

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June 27, 1939. H FE 2,163,788

mmsmz cLEmER Filed July 22, 1936 2 Sheets-Sheet 2 Indefi- Patented June 27, 1939 UNITED STATES PATENT OFFICE 1 Claim.

The invention relates to improvements in cleaners especially adapted for use in cleaning blackboard erasers, the primary object of the invention being the provision of a simple apparatus of the character indicated which is capable of economical production and highly efficient in use.

Other objects will appear hereinafter.

The invention consists in the combinations and arrangements of parts hereinafter described and claimed.

The invention will be best understood by reference to the accompanying drawings forming a part of this specification, and in which Fig. l is a top plan view of an eraser cleaner embodying the invention;

Fig. 2 a side view of the same;

Fig. 3 an end view of the same;

Fig. 4 a partial longitudinal section of the same; and

Fig. 5 a transverse section of the same.

The embodiment of the invention illustrated in the drawings comprises an enclosing casing mounted upon a suitable base 10, said casing being provided in one end with a motor chamber l I adapted and arranged to contain and enclose an electric motor of any usual or conventional design and construction. A fan chamber I2 is arranged adjacent the inner end of the motor chamber H and a cleaning chamber i3 is ar ranged adjacent the fan chamber l2 as shown. The shaft M of the electric motor is extended from the motor chamber ll substantially centrally through the chambers l2 and [3 as shown.

An exhaust fan i5 is mounted as shown on the motor shaft l4 and is arranged and adapted to withdraw or exhaust air from the chamber l3 through the central opening 5 and discharge said air through the discharge spout ll, which is adapted and arranged to receive and support the mouth of a dust bag, as will be readily understood.

The cleaning chamber I3 is made upwardly flaring in form, as best shown in Figs. 4 and 5, and is provided with a rectangular opening [8 at its top in which a foraminated rectangular cleaning element I9 is arranged to reciprocate. As will be noted, the opening I8 is provided at one end with a depression and an outwardly extending supporting lip, best shown in Fig. 5, adapted and arranged to support an eraser or the like in position for cleaning. The cleaning element I9 is in'the form of a grid consisting of spaced transverse and longitudinal bars or slats as shown, so as to permit of the free entry of air and dust to the cleaning chamber 13. The cleaning element I9 is connected by an integral arm or support with the motor shaft l4 through the medium of a ball bearing 2i riding upon an eccentric crank pin 22 formed integrally in the motor shaft 14, and whereby the cleaning element I9 will be caused to reciprocate rapidly as the motor shaft I4 rotates.

In use and in operation, the cleaning element I9 is rapidly reciprocated by operation of the electric motor which also serves to rotate the fan I5. An eraser to be cleaned is then manually placed in opening 18 on the rest and thus applied to the cleaning element l9 through the opening l8 in such manner that the face of the eraser will be rapidly struck and beaten by the action of the cleaning element [9, thereby loosening the blackboard dust contained therein. At the same time, the fan 15 operates to draw a strong draft of air through and around the eraser, though chamber l3, opening l6, fan chamber l2, and discharging the same through the spout I1 into the dust bag connected therewith. In this way, blackboard erasers, such as are used in schools and similar institutions, may be rapidly and efficiently cleaned and prepared for re-use. The specific form and arrangement of parts disclosed is a simple and efficient one for the purpose.

While I have illustrated and described the preferred form of invention for carrying my invention into effect, this is capable of variation and modification without departing from the spirit of the invention. I, therefore, do not wish to be limited to the precise details disclosed but desire to avail myself of such variations and modifications as fall Within the scope of the appended claim.

I claim:

A cleaner comprising a casing having a motor chamber in one end thereof; a fan chamber adjacent the inner end of said motor chamber and having an air discharge spout arranged for the attachment of a dust bag; a cleaning chamber adjacent said fan chamber in open communication therewith, the top of said cleaning chamber having walls forming a rectangular opening one wall of which is depressed to form and a laterally extending supporting lip to constitute a rest for an object to be cleaned; a foraminated rectangular cleaning element arranged in said cleaning chamber below said rest and reciprocating therein to strike said object a blow to release dust therefrom; a motor shaft extending from the motor chamber through said fan chamber and said cleaning chamber; an exhaust'fan on said motor shaft in said fan chamber and arranged to exhaust air from said cleaning chamber through said dust bag spout; an eccentric on said motor shaft in said cleaning chamber; and an operative connection between said eccentric and said cleaning element.

FRED L. HENNEFER. 

